MDEV-30623: Fix the testcase

- Fix view-protocol: long expressions in SELECT
  list should have "expr AS column_name".

- Also, moved the test from subselect*test to
  suite/json/t/json_table.test.

mysql-test/suite/json/r/json_table.result

@@ -1011,5 +1011,30 @@ Jeans
 SELECT 1 FROM JSON_TABLE (row(1,2), '$' COLUMNS (o FOR ORDINALITY)) AS j;
 ERROR 21000: Operand should contain 1 column(s)
 #
+# MDEV-30623 JSON_TABLE in subquery not correctly marked as correlated
+# update_correlated_cache() fails to take JSON_TABLE functions in
+# subqueries into account.
+#
+create table t1(c json);
+insert into t1 values ('[{"x":"1"},{"x":"2"}]'),
+('[{"x":"10"},{"x":"20"}]'),
+('[{"x":"100"},{"x":"200"}]');
+select c,
+(SELECT sum(x) FROM json_table(c, "$[*]" columns( x int path "$.x"))
+AS jt) as SUBQ
+from t1;
+c	SUBQ
+[{"x":"1"},{"x":"2"}]	3
+[{"x":"10"},{"x":"20"}]	30
+[{"x":"100"},{"x":"200"}]	300
+explain select c,
+(SELECT sum(x) FROM json_table(c, "$[*]" columns( x int path "$.x"))
+AS jt) as SUBQ
+from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
+2	DEPENDENT SUBQUERY	jt	ALL	NULL	NULL	NULL	NULL	40	Table function: json_table
+drop table t1;
+#
 # End of 10.6 tests
 #